• J.W. Amann, R. Arnold, A. Seryi, D.R. Walz
  SLAC, Menlo Park, California
• K. Kulkarni, P. Rai, P. Satyamurthy, V. Tiwari
  BARC, Mumbai
• H. Vincke
  CERN, Geneva

Significant progress has been made in the design of an 18MW Beam Dump for 500 GeV electron/positron beams at an ILC. The beam dump design is based on circulating water with a vortex-like flow pattern to dissipate and remove the energy deposited by the beam. Multi-dimensional technology issues have been addressed to design the beam dump system. Detailed thermal-hydraulic analysis was carried out in all the critical regions of the beam dump which include, 1) location of highest volumetric power deposition by the beam, 2) location of highest linear power deposition, 3) entrance window region, 4) vessel walls etc. Based on this analysis, the sizing of the beam dump and its components, water flow rate and inlet jet velocity, optimum location of the beam path in the beam dump, beam sweep radius etc have been estimated. In addition, preliminary mechanical design of the beam dump, cooling circuit details, sizing of the hydrogen/oxygen recombiner system, ion exchange and 7Be removal, prompt and residual radioactivity studies etc have been carried out. Details of this work will be presented.